24, What is the role of front-end equipment?
Network HD video surveillance system in the system, the role of the front-end subsystem to achieve the main control point of the audio and video data, digital alarm data acquisition and audio and video coding compression and network transmission. Front-end equipment mainly includes:
1, image encoding equipment (digital video recorder DVR, embedded video server, network camera);
2, audio and video capture equipment (cameras, pickups);
3, PTZ / PTZ decoder;
4, alarm input / output devices (switch equipment, alarm, etc.);
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